Substitution of High-Yield-Pulp for Hardwood Bleached Kraft Pulp in Paper Production and Its Effect on Alkenyl Succinic Anhydride Sizing

Abstract

In recent years there has been an increasing interest in using high-yield pulp (HYP) as a partial replacement for hardwood bleached kraft pulp (HWBKP) in the production of high-quality fine papers as a cost-effective way of improving the product performance. This study investigated the substitution of HYP for HWBKP and its effect on the Alkenyl Succinic Anhydride (ASA) sizing performance. The results showed that the substitution of an aspen HYP for HWBKP can increase the ASA sizing performance at a HYP substitution as high as 15 to 20%. The ASA addition sequence has an influence on the ASA sizing performance and first adding ASA to the HYP followed by mixing with kraft pulps was the preferred method. Using precipitated calcium carbonate (PCC) as a paper filler at a dosage of less than 20% can increase the ASA sizing performance due to the contribution of the calcium soap of the hydrolysed ASA. A PCC dosage greater than 20% resulted in a negative impact on the sizing performance. It was also found that different PCC loading sequences can also affect the ASA sizing performance.

Alkenyl Succinic Anhydride: The Question of Covalent Bonding and Chemistry Considerations for Better Sizing – Review

“…In addition, the use of alum controls the deposit of hydrolyzed ASA, and the aluminum salt of the hydrolyzed ASA may interact with the anionic charges on cellulose to improve sizing. Furthermore, the application of alum can anchor free hydrolyzed ASA to the fiber as a metal salt to reduce, to delay, or to reverse size reversion due to migration, reorientation or fugitivity [26,52,67,75].…”

Using cationic polymers to improve alkenyl succinic anhydride (ASA) sizing efficiency in high-yield pulp containing furnish

“…For the emulsification, the rotor speed was set to 20,000 rpm, and the shearing time was 2 minutes. The ASA emulsion prepared was uniform and homogeneous (Chen et al 2012), and the freshly prepared ASA emulsion was used in the experiments.…”

“…The effects of substituting HYP for hardwood kraft pulp on AKD sizing or rosin sizing have been studied (Hu et al 2004;Li et al 2002a,b;Zhang et al 2007). In a previous study (Chen et al 2012), the substitution of HYP for HWBKP in the production of fine papers and its effect on ASA sizing performance were investigated. Results showed that at a HYP substitution of less than 20%, the ASA sizing efficiency could be increased by using HYP in such a system.…”

Preparation of starch and laponite co-stabilized alkenyl succinic anhydride emulsions for paper sizing

“…The purpose is to decrease the penetration rate of water or the other fluids into paper. [1][2][3][4] Alkenyl succinic anhydride (ASA), a polar viscous oil, is one of the typical internal sizing agents added to paper furnish as an oil-in-water emulsion. [4][5][6][7] ASA has a relatively high chemical reactivity to both cellulose fibers and water, making it possible to achieve a high sizing performance on paper machine, yet unavoidably undergoing hydrolysis.…”

“…A large quantity of cationic starch has to be employed to improve the sizing performance and to reduce the hydrolysis of ASA in emulsions. [1][2] As a consequence, the obtained ASA emulsions have a fairly low concentration, which results in a rather low production efficiency for the preparation of ASA emulsions. To prepare ASA emulsions with higher ASA content, a co-emulsifier/co-stabilizer is required for reducing the charge amount of starch and suppressing the hydrolysis of ASA.…”